I'm interested to know how people in Europe are installing their Call Manager environment. Specifically, how alaw and ulaw are handled. Is it alaw everywhere (IPphone-to-IPphone, IPphone-to-gateway, IPphone-to-Unity, etc...) ? Do you use the CM ulaw default and let the gateway do the conversion ?
Can somebody educate a US person to understand all this ?
I too always wondered how is it done in Europe in general. I guess, the method that you guessed makes sense and easy to administer too. Can any user in Europe enlighten us if you follow some other strategy?
But I understand there are some limitations- using alaw with CRA.
I participated in many installations and we always leave the incoding to ulaw. It is only for external connections that the gateway will convert this to the necessary alaw encoding. I have only met 1 guy who claimed he could hear the quality degradation after converting from ulaw to alaw.(my ears can't)
It would be possible to change the default encoding to alaw but I really don't see a reason to do this so I advice my customers to stick with the defaults.
We currently use G.729a for all standard voice calls due to bandwidth issues. We connect to PSTN Via a PBX then a microwave link to the site where CM is installed:
PSTN <--> (ISDN Dass2) PBX <--> Q.931 to router <--> Microwave link (10Mb) <--> CCM
We have a back link that runs at 512K only. Due to the concerns of the backup link we decided to go with G.729a.
We have recently setup a new region that runs G.711 for conferencing and transcoding on Cat 4006 AGM Blade due to no support in software on CCM for G.729a. Faxes also use G.711 and everything seems to work ok.
The short answer is that you don't.... That isn't entirely true while at
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the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
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